Originally Posted by
spacediver
One thing I've observed about experienced people (and this holds in many domains, not just human movement), is that they require less information than most to make accurate judgments. In your case, you're often able to make diagnoses with a single rep.
Along that line of thinking, here's a question:
Do you find yourself making a judgement about hip drive efficiency by integrating multiple sources of information (bar path, anthropometry, bar speed, arc that hip traces out, spinal curvature, etc.), and getting a real gestalt of the movement, or do you find that it's more reliable to focus attention on a single marker.